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r²=25 cm²
r=5 cm
b) 4πr²=1 m²
r²=1/(4π) m²
r=1/(2√π) m²
c) (4/3)πr³=288π cm³
r³= 216 cm³
r= 6 cm
d) (4/3)πr³= 36 dm³
r³= 27/π dm³
r=3/³√π dm